Description

KTM 125, EXC, SX, MXC 2001 Parts Catalog

You have a 2001 KTM 125 (SX, MXC, or EXC) on the lift, and you need a specific part. Maybe the cylinder base gasket thickness is wrong, or the power valve stop disk is missing. Without the factory parts catalog, you’re guessing part numbers, ordering wrong pieces, and burning time on returns. I’ve seen it happen in my shop: a guy slaps on a 2000 cylinder head gasket on a 2001 engine and wonders why the compression is off. This Parts Catalog from KTM—59 pages of OEM exploded views and part numbers—stops that nonsense cold.

The manual is a digital copy of the official 2001 KTM 125-200 (SX / MXC / EXC) parts catalog. It’s not a reprint from a third-party warehouse. It’s the original PDF from KTM, scanned and indexed with bookmarks. Every part number, every fastener, every gasket thickness is listed as KTM intended. You want the correct cylinder head bolt? The catalog shows part number 500.30.079.000 (M7x40, WS=10, six of them). Need the intermediate flange for the 125? Part 503.37.001.100. That level of detail is what this catalog delivers.

Cylinder and Power Valve: Factory-Indexed Parts

The first sections cover the cylinder, power valve (two pages), and crankshaft. Each section has an exploded diagram with callouts matching the parts list. The power valve section includes the stop disk (490.33.031.015), side covers, gaskets, and needle rollers. If your Valve mechanism is rattling, you can identify the exact O-ring or bushing from the list. The catalog also shows the Cylinder base gasket thicknesses—0.07mm, 0.15mm, 0.20mm, 0.25mm, 0.40mm, 0.50mm, 0.75mm—so you can pick the right one for your squish clearance. No more using a generic gasket and hoping it seals.

What Does the 59-Page Parts Catalog Cover?

Every major system on the bike is broken down. The Engine case, clutch cover, oil pump, clutch, transmission (two pages), kickstarter, shifting mechanism, cooling system (separate pages for SX/MXC and EXC), reed valve, carburetor (two pages), air box, exhaust, silencer (125 and 200), fuel tank (three pages), fenders, frame, swingarm, side stand, handlebars, front and rear wheels, brakes, forks, shock, ignition, headlight, taillight, wiring diagrams (separate for EXC USA and EXC), speedometer variants, accessories, and special tools. The Transmission section shows every gear, shaft, bearing, and circlip. The Cooling system parts include radiators, hoses, and clamps with part numbers. The Fuel tank pages list the tank, cap, petcock, and mounting hardware. If you’re rebuilding a 2001 125, this catalog is the only source you need for part numbers.

3 Systems You Must Check Before Reassembly

First, the Crankshaft assembly. The catalog shows the complete crankshaft with connecting rod, bearings, and seals. Order the correct crank pin and bearing set—don’t mix up 125 and 200 parts. Second, the Engine case with oil pump. The 200 models have a separate oil pump page; the 125 uses a different crankcase. Third, the wiring: the EXC USA wiring diagram is different from the standard EXC. If you’re chasing an electrical issue, the catalog lists each connector and wire color. Skipping these checks leads to oil leaks, seized bearings, or fried electronics.

Get the Right Crankshaft Specs

The crankshaft section (page 1 and 2) lists the part numbers for the complete crank, the flywheel, and the stator. It also includes the woodruff key and the retaining plate (510.05.074.000). If you’re rebuilding the bottom end, you need the factory part numbers to order from KTM or a dealer. The manual also includes the special tools section at the end—tools like the flywheel puller and clutch holder. Don’t use a universal puller on a KTM crank; get the correct KTM tool part number from the catalog.

Engine Case and Transmission: Exploded Views with Torque References

The engine case section shows the left and right cases, the oil pump, and the clutch cover. The transmission pages list every gear, shaft, and shift fork. The catalog does not include torque values (that’s in the service manual), but it gives you the exact part numbers for the bearings and seals. When you’re ordering replacement parts, cross-reference the part numbers against the Internal Combustion Engine Wikipedia page for general understanding, but use the catalog for the bike-specific numbers. The Automotive Industry Overview might give you background, but it won’t tell you that the 2001 KTM 125 EXC uses a 54mm cylinder with a 72x2mm O-ring.

Related Manuals You Might Need

• KTM 125 200 Repair Manual”>KTM 125 200 Repair Manual – for torque specs and service procedures.
• KTM 125 EXC SIX DAYS 2007 Operators Manual”>KTM 125 EXC SIX DAYS 2007 Operators Manual – operator info for later models.
• 2008 KTM 690 SMC Chassis Spare Parts Manual”>2008 KTM 690 SMC Chassis Spare Parts Manual – if you’re working on a different KTM.

Why This OEM Catalog Matters

Aftermarket parts catalogs often combine multiple years or models, and they get the part numbers wrong. This is the original 2001 KTM PDF, directly from the factory. The 59 pages are indexed with bookmarks, so you can jump to the cylinder, transmission, or fuel tank in two clicks. The exploded views are clean, and the part numbers are listed with quantities and descriptions. If you’re rebuilding a 2001 KTM 125, SX, MXC, or EXC, this is the only parts catalog you need. Stop guessing, start ordering the right parts.

Does this catalog include torque specifications for the cylinder head bolts?

No. This is a parts catalog, not a service manual. It lists part numbers, not torque values. For torque specs, you need the official KTM service manual.

Can I use this catalog to identify parts for a 2002 KTM 125 EXC?

The 2001 catalog is specific to the 2001 model year. While some parts may carry over, KTM made changes between years. Using a 2001 catalog for a 2002 bike risks ordering the wrong cylinder head gasket or power valve components. Always get the correct year catalog for your bike. The 2001 catalog covers 125/200 models with SX, MXC, and EXC variants. If you have a 2002, look for the 2002 parts catalog. The frame and engine case part numbers often change. If you’re unsure, compare the part numbers from your bike’s VIN with the diagrams in this catalog. The exploded views are detailed enough to spot differences—for example, the 2001 cylinder uses a 54mm bore, while later years may have a different bore. The catalog also includes the fuel tank section for the 2001 EXC, which has a different part number than the SX tank. For cross-referencing, you can check the Internal Combustion Engine article for general engine architecture, but the part numbers are unique to the OEM catalog. Bottom line: if your bike is a 2001, this catalog is exact. If it’s a different year, find the correct catalog.

Access the Factory Manual. Get the 2001 KTM 125 SX MXC EXC Parts Catalog and stop wasting time on wrong parts. The PDF is fully searchable, 59 pages, and contains every OEM part number you need for a complete rebuild or repair. Order it now and have the factory data on your screen or printed out.